invoking one form from another

Hi all

 I didn't find any examples or docs on how ot invoke one form 
 from another. Therefore I have a few questions. 

 1. Does every form created by "Shift-Ctrl-N" introduce a new 
    class? or just few functions are introduced?

 2. How to make the code corresponding for a second form being 
    accessible from the code of the first form? I try to invoke form2
    by reacting at button with code:

(defun form1-button4-on-click (dialog widget)
  (declare (ignore-if-unused dialog widget))
  (form2)
  t)

It works somehow, but the form being appeared is a bit different 
then designed by me.
:-/

P.S. writing this email I understand that I give another 
     possibility to spammers to attack my current email :(
     Indeed, all addresses (and mine) are accessible at
     ftp://ftp.franz.com/pub/misc/allegro-cl-log

kind regards,
Valery A.Khamenya
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Bioinformatics Department
BioVisioN AG, Hannover